Sharp World Clock is described as 'is the most advanced Software World Clock available, showing multiple analog or digital Clocks on your Desktop and the exact Time in any major City of the World'. There are more than 25 alternatives to Sharp World Clock for a variety of platforms, including Online / Web-based, Windows, iPhone, iPad and Android. The best alternative is timeanddate.com, which is free. Other great apps like Sharp World Clock are World Time Buddy (Freemium), Time.is (Freemium), timee.io (Free) and FoxClocks (Free, Open Source).
FoxClocks is a Firefox/Thunderbird extension to display local times around the world in your status bar or any toolbar. Virtually all the worlds time zones are supported. FoxClocks also allows you to explore each time zone in Google Earth.
WorldClock shows you the time in different places over the world. Also included are the Swatch Internet Time, Julian Date and StarDate. You can also use it to synchronize the time with an atomic clock.